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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Robert H. Byrne</dc:contributor>
  <dc:contributor>Kimberly Yates</dc:contributor>
  <dc:creator>Christopher Moore</dc:creator>
  <dc:date>2024</dc:date>
  <dc:description>&lt;div class="abstract-group "&gt;&lt;div class="article-section__content en main"&gt;&lt;p&gt;This work assesses the effectiveness of sample preservation techniques for measurements of pH&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(total scale), total dissolved inorganic carbon (C&lt;sub&gt;T&lt;/sub&gt;), and total alkalinity (A&lt;sub&gt;T&lt;/sub&gt;) in organic-rich estuarine waters as well as the internal consistency of measurements and calculations (e.g., A&lt;sub&gt;T&lt;/sub&gt;, pH&lt;sub&gt;T&lt;/sub&gt;, and C&lt;sub&gt;T&lt;/sub&gt;) in these waters. Using mercuric chloride (HgCl&lt;sub&gt;2&lt;/sub&gt;)-treated and untreated water samples, measurements of these carbonate system parameters were examined over a period of 3 months. Respiration of dissolved organic matter in untreated samples created large discrepancies in C&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;concentrations (~37 &lt;i&gt;μ&lt;/i&gt;mol kg&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;increase,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;p&lt;/i&gt; &amp;lt; 0.0001), while C&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;was effectively constant in treated samples (3095.0 ± 1.14 &lt;i&gt;μ&lt;/i&gt;mol kg&lt;sup&gt;−1&lt;/sup&gt;). A&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;changes were observed for both treated and untreated samples, with HgCl&lt;sub&gt;2&lt;/sub&gt;-treated samples showing the greatest variation (~ 26 &lt;i&gt;μ&lt;/i&gt;mol kg&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;decrease,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;p&lt;/i&gt; &amp;lt; 0.001). In response to changing A&lt;sub&gt;T&lt;/sub&gt;/C&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;ratios, pH&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;changes occurred in both treated and untreated samples but were relatively small in treated samples. Results in organic-rich estuarine waters that reflect the in situ carbonate system characteristics of the samples at the time of collection can be improved when samples obtained for C&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and A&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;analysis are collected and stored separately. Accurate analyses of C&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;can be obtained by filtration and preservation with HgCl&lt;sub&gt;2&lt;/sub&gt;. Accuracy of A&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;analyses can be improved by filtration and storage without adding HgCl&lt;sub&gt;2&lt;/sub&gt;. The quality of pH&lt;sub&gt;T&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;measurements can be improved by prompt analysis in the field and, if this cannot be accomplished, then samples can be preserved with HgCl&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and measured in the laboratory within 1 week.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1002/lom3.10593</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Association for the Sciences of Limnology and Oceanography</dc:publisher>
  <dc:title>An assessment of HgII to preserve carbonate system parameters in organic-rich estuarine waters</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>